Hybrid gearbox shell with integrated lubricating structure and hybrid gearbox

Abstract

The invention relates to the technical field of automobile driving, in particular to a hybrid gearbox shell integrated with a lubricating structure and a hybrid gearbox. The hybrid gearbox shell comprises a left shell body and a right shell body, the left shell body and the right shell body are of a semi-enclosed cavity structure, the left shell body and the right shell body are enclosed together to form a complete cavity structure, a gearbox assembly mounting part and an oil tank part are arranged in the cavity structure, and the gearbox assembly mounting part is communicated with the oil tank part through an oil duct in the shell; the oil tank part at least comprises a first oil tank, the first oil tank is located below the gearbox assembly mounting part, and an electronic pump is integrated in the first oil tank and provides power for lubricating oil; the oil tank part further comprises a second oil tank and a third oil tank; the second oil tank is positioned above the gearbox assembly mounting part; and the third oil tank is positioned on the lateral upper side of the gearbox assembly mounting part. While the structure is simplified, the bearing and part of the gears are forcibly lubricated, so that the oil stirring loss is reduced, and the transmission efficiency and the fuel economy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive drive, and particularly to a hybrid transmission housing with an integrated lubrication structure and a hybrid transmission. Background Art

[0002] Hybrid electric vehicles utilize different power sources to exert their respective advantages under different working conditions, achieving the best power matching and energy management, with good fuel economy, excellent power performance, and friendly emission performance, and have become the best energy-saving vehicle promotion route at present. The hybrid vehicle transmission integrates power components such as drive motors and generators, and mechanical components such as wet multi-plate clutches, bearings, and gears. Under different working modes, the power components and mechanical components have different cooling and lubrication requirements, and there are problems such as large heat generation, many cooling and lubrication requirement points, and complex cooling and lubrication structure design.

[0003] In the existing common technologies, the cooling methods of the drive motor and generator of the hybrid transmission assembly usually adopt oil cooling; the cooling method of the clutch also adopts oil cooling; the bearings and gears usually adopt non-forced methods such as splash lubrication for lubrication. Due to the large cooling and lubrication flow requirements of the drive motor and generator, and there are many friction pairs that need to be cooled and lubricated in the transmission system, mechanical pumps and electronic pumps are usually used together to provide oil for the cooling lubrication oil circuit, and a cooling lubrication flow distribution structure is set to distribute the oil provided by the two oil pumps to each required point. The cooling lubrication system usually sets solenoid valves to control the interruption of the oil circuit or change the oil circuit direction, so as to supply oil to different heating elements for cooling in different driving modes.

[0004] The main function of the hybrid system clutch is to connect or disconnect the engine from the power transmission system to achieve the switching of different driving modes. Due to the short sliding friction time during mode switching, the cooling flow requirement of the clutch is relatively not high compared to that of the clutch in the traditional power system. Using a solenoid valve to control the interruption of the clutch oil circuit or change the oil circuit direction will increase the design complexity of the hydraulic system, increase the control difficulty, and at the same time increase the manufacturing cost.

[0005] When both a mechanical pump and an electronic pump are set in the lubrication cooling oil circuit to supply oil to the drive system, the volume occupied by the oil pumps is relatively large, increasing the layout difficulty and making the control system more complex. Under the condition of low speed and large torque, the mechanical pump rotates at a low speed and provides less oil volume, posing a risk of poor lubrication.

[0006] The bearing uses splash lubrication, and it is impossible to accurately evaluate whether the oil splashed onto each friction point is sufficient to carry away the heat generated by meshing. There is a risk of over-temperature failure of the bearing. In the extreme angle working condition, some gears may be above the oil level and cannot stir the oil. Only relying on splash lubrication will not be able to meet the cooling requirements. Moreover, it will bring higher oil churning losses and reduce the transmission efficiency and fuel economy. Summary of the Invention

[0007] In order to solve the deficiencies of the above-mentioned prior art, the present invention designs a hybrid transmission housing and a hybrid transmission with an integrated lubrication structure. The structure of the present invention is concise, and the power system for driving the lubricating oil is optimized; components such as solenoid valves that interrupt or change the oil flow direction in the prior art are removed; and forced lubrication is used to cool the bearings and some gears, reducing the oil churning loss and improving the transmission efficiency and fuel economy.

[0008] The technical solution of the present invention is: a hybrid transmission housing with an integrated lubrication structure, comprising:

[0009] A left housing and a right housing, both the left housing and the right housing are semi-enclosed cavity structures, and when they are enclosed together, a complete cavity structure can be formed. The cavity structure includes a transmission assembly installation part and an oil tank part, and the transmission assembly installation part and the oil tank part are separated by a number of oil baffle ribs;

[0010] The transmission assembly installation part includes a driving motor input shaft shafting installation part, an intermediate shaft shafting installation part, a differential installation part, a clutch shaft shafting installation part, and a generator input shaft shafting installation part;

[0011] The oil tank part includes at least a first oil tank, the first oil tank is located below the transmission assembly installation part and is connected with an electronic pump, and the electronic pump is used to pump the lubricating oil in the first oil tank into the internal oil passage of the housing; the oil tank part also includes a second oil tank and a third oil tank, the second oil tank and the third oil tank are located above the transmission assembly installation part and receive the lubricating oil flowing out of the internal oil passage of the housing; the bottoms of the second oil tank and the third oil tank are respectively connected with oil passing holes, and the oil passing holes are respectively used to guide the lubricating oil to the hole parts of the transmission assembly installation part.

[0012] According to a hybrid transmission housing with an integrated lubrication structure provided by the present invention, the first oil tank includes a first oil tank first oil baffle rib, a first oil tank second oil baffle rib, a first oil tank third oil baffle rib, and a first oil tank fourth oil baffle rib. The first oil tank first oil baffle rib and the first oil tank second oil baffle rib are located on the left housing and enclose with the cavity wall of the left housing to form the left part of the first oil tank; the first oil tank third oil baffle rib and the first oil tank fourth oil baffle rib are located on the right housing and enclose with the cavity wall of the right housing to form the right part of the first oil tank.

[0013] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, after the left housing and the right housing are installed together, there is a gap between the first oil retaining rib of the first oil tank and the third oil retaining rib of the first oil tank.

[0014] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, the second oil tank is located above the clutch shaft shafting installation part and the generator input shaft shafting installation part, and includes a first oil retaining rib of the second oil tank and a second oil retaining rib of the second oil tank. The first oil retaining rib of the second oil tank is located on the left housing and encloses the left part of the second oil tank with the cavity wall of the left housing; the second oil retaining rib of the second oil tank is located on the right housing and encloses the right part of the second oil tank with the cavity wall of the right housing.

[0015] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, the second oil tank further includes a first flow dividing rib of the second oil tank and a second flow dividing rib of the second oil tank. One end of the first flow dividing rib of the second oil tank is connected to the first oil retaining rib of the second oil tank; one end of the second flow dividing rib of the second oil tank is connected to the second oil retaining rib of the second oil tank; the combination of the two divides the lubricating oil liquid at the bottom of the second oil tank into two parts, one part for lubricating the gears meshing between the clutch shaft shafting and the intermediate shaft shafting, and the other part for lubricating the generator input shaft shafting installation part.

[0016] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, the second oil tank further includes a boss, and an oil outlet is provided on the boss. The oil outlet is connected to the clutch shaft shafting installation part through an internal oil passage of the housing.

[0017] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, after the left housing and the right housing are installed together, the first oil retaining rib of the second oil tank contacts and coincides with the second oil retaining rib of the second oil tank; the first flow dividing rib of the second oil tank contacts and coincides with the second flow dividing rib of the second oil tank.

[0018] For a hybrid transmission housing with an integrated lubrication structure provided by the present invention, the third oil tank is located at the side upper part of the drive motor input shaft shafting installation part, the intermediate shaft shafting installation part, and the differential installation part, and includes a first oil retaining rib of the third oil tank and a second oil retaining rib of the third oil tank. The first oil retaining rib of the third oil tank is located on the left housing and encloses the left part of the third oil tank with the cavity wall of the left housing; the second oil retaining rib of the third oil tank is located on the right housing and encloses the right part of the third oil tank with the cavity wall of the right housing.

[0019] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the third oil tank further includes a first diversion rib and a second diversion rib of the third oil tank. One end of the first diversion rib of the third oil tank is connected to the first oil retaining rib of the third oil tank; one end of the second diversion rib of the third oil tank is connected to the second oil retaining rib of the third oil tank; the combination of the two separates the lubricating oil at the bottom of the third oil tank into two parts, one part for lubricating the intermediate shaft shaft system installation part, and the other part for lubricating the differential installation part.

[0020] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the third oil tank further includes a boss, and an oil outlet is provided on the boss, and the oil outlet is connected to the drive motor input shaft shaft system installation part through an internal oil passage of the housing.

[0021] A hybrid transmission housing with an integrated lubrication structure according to the present invention, after the left housing and the right housing are installed together, the first oil retaining rib and the second oil retaining rib of the third oil tank are in contact and coincide; the first diversion rib and the second diversion rib of the third oil tank are in contact and coincide.

[0022] A hybrid transmission housing with an integrated lubrication structure according to the present invention further includes a motor housing, the motor housing is a semi-enclosing structure, and forms a motor assembly installation part with the back surface of the left housing. The motor assembly installation part includes a drive motor installation part and a generator installation part.

[0023] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the drive motor installation part is correspondingly connected to the drive motor input shaft shaft system installation part; the generator installation part is correspondingly connected to the generator input shaft shaft system installation part.

[0024] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the motor housing is also provided with a plurality of oil passages for guiding the lubricating oil to flow in the transmission assembly installation part, the oil tank part and the motor assembly installation part.

[0025] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the oil passages on the motor housing at least include a first oil passage and a second oil passage. The first oil passage is used to guide the lubricating oil to the generator installation part; the second oil passage is used to guide the lubricating oil to the second oil tank and the drive motor installation part.

[0026] A hybrid transmission housing with an integrated lubrication structure according to the present invention, the destinations of the lubricating oil on the second oil passage include a third oil passage and a fourth oil passage. The third oil passage is used to guide the lubricating oil to the second oil tank; the fourth oil passage is used to guide the lubricating oil to the third oil tank and the drive motor installation part.

[0027] A hybrid transmission housing with an integrated lubrication structure provided by the present invention, the destinations of the lubricating oil in the fourth oil passage include a fifth oil passage and a sixth oil passage. The fifth oil passage is used to guide the lubricating oil to the drive motor mounting portion; the sixth oil passage guides the lubricating oil to the third fuel tank.

[0028] A hybrid transmission housing with an integrated lubrication structure provided by the present invention further includes a heat exchanger. The heat exchanger is integrated on the left housing. One end thereof is connected to the outlet of the electronic pump through the internal oil passage of the left housing, and the other end is connected to the motor assembly mounting portion through the internal oil passage of the left housing.

[0029] A hybrid transmission housing with an integrated lubrication structure provided by the present invention, a return oil port is provided in the first fuel tank. The return oil port penetrates the bottom of the left housing and communicates the first fuel tank with the motor assembly mounting portion.

[0030] Based on the same inventive concept, the present invention also provides a hybrid transmission, which includes the hybrid transmission housing with an integrated lubrication structure described in any one of the above.

[0031] The advantages of the present invention are as follows:

[0032] 1. The present invention uses an electronic pump to provide cooling lubricating oil for the power components and mechanical components of the hybrid transmission, which can effectively reduce the layout difficulty and the control difficulty of the oil pump.

[0033] 2. There is no solenoid valve to interrupt or change the oil flow direction to the clutch cooling oil passage between the clutch cooling oil passage and the outlet of the electronic pump of the present invention, which can effectively reduce the complexity of the hydraulic system design, reduce the control difficulty, and reduce the manufacturing cost.

[0034] 3. The bearings and some gears of the present invention are cooled by forced lubrication. At the same time, by adjusting the size of the throttle holes of the cooling lubricating oil passage integrated on the transmission line housing, the cooling lubricating flow required by each component is accurately provided, ensuring that all friction pairs in the gearbox are in good lubrication state under various working conditions, effectively reducing the oil filling amount and the oil level height in the gearbox, reducing the oil filling cost, reducing the gear churning loss, and improving the transmission efficiency and fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the layout of the transmission assembly mounting portion of the hybrid transmission housing of the present invention;

[0036] Figure 2 Schematic diagram of the layout of the fuel tank portion of the hybrid transmission housing of the present invention;

[0037] Figure 3Schematic diagram of the installation part of the motor assembly on the left housing of the present invention;

[0038] Figure 4 Schematic diagram of the structure of the left housing, electronic pump and heat exchanger of the present invention;

[0039] Figure 5 Schematic diagram of the oil passing hole on the left housing of the present invention;

[0040] Figure 6 Schematic diagram of the oil passing hole on the back of the left housing of the present invention;

[0041] Figure 7 Schematic diagram of the oil passing hole on the right housing of the present invention;

[0042] Figure 8 Schematic diagram of the oil passing hole on the motor housing of the present invention;

[0043] Figure 9 Schematic diagram of the oil circuit on the motor housing of the present invention;

[0044] Wherein: left housing 1; oil suction port 101; oil return port 131; right housing 2; first fuel tank 30; first oil retaining rib 301 of the first fuel tank; second oil retaining rib 302 of the first fuel tank; third oil retaining rib 303 of the first fuel tank; fourth oil retaining rib 304 of the first fuel tank; second fuel tank 40; first oil retaining rib 401 of the second fuel tank; second oil retaining rib 402 of the second fuel tank; first flow dividing rib 403 of the second fuel tank; second flow dividing rib 404 of the second fuel tank; third fuel tank 50; first oil retaining rib 501 of the third fuel tank; second oil retaining rib 502 of the third fuel tank; first flow dividing rib 503 of the third fuel tank; second flow dividing rib 504 of the third fuel tank; motor input shaft shafting installation part a; intermediate shaft shafting installation part b; differential installation part c; clutch shaft shafting installation part d; generator input shaft shafting installation part e; drive motor installation part f; generator installation part g; electronic pump m; heat exchanger n. Detailed description of the specific implementation

[0045] The embodiments of the present invention will be described in detail below, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0048] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0049] The present invention relates to a hybrid transmission housing and a hybrid transmission with an integrated lubrication structure. Compared with the prior art, the structure of the present invention is streamlined, and the power system for driving lubricating oil is optimized; components such as solenoid valves that interrupt or change the oil flow direction in the prior art are removed; and forced lubrication is used to cool the bearings and some gears, reducing oil churning losses and improving transmission efficiency and fuel economy.

[0050] A hybrid transmission housing with an integrated lubrication structure, specifically, as Figure 1As shown, it includes a left housing 1 and a right housing 2. Both the left housing 1 and the right housing 2 are semi-enclosed cavity structures. Multiple bolt connection holes are provided on the edges of the cavity openings of the two. Through bolt connection, the two can form a complete cavity structure. The cavity structure includes a transmission assembly installation part and an oil tank part. The transmission assembly installation part and the oil tank part are separated by several oil baffle ribs; the transmission assembly installation part includes a drive motor input shaft system installation part a, an intermediate shaft system installation part b, a differential installation part c, a clutch shaft system installation part d, and a generator input shaft system installation part e. The shaft systems are driven by gear meshing, and the central axes of each shaft are parallel to each other;

[0051] The oil tank part includes a first oil tank 30, a second oil tank 40, and a third oil tank 50. The first oil tank 30 is located below the transmission assembly installation part; the second oil tank 40 is located above the clutch shaft system installation part d and the generator input shaft system installation part e; the third oil tank 50 is located above the side of the drive motor input shaft system installation part a, the intermediate shaft system installation part b, and the differential installation part c;

[0052] An electronic pump m is also integrated on the left housing 1. The electronic pump m is located inside the first oil tank 30. Its inlet is connected to the first oil tank 30 through an oil suction port 101, and its outlet is connected to the internal oil passage of the housing.

[0053] Actually, the electronic pump m is installed in an embedded manner, and its oil suction port 101 is directly immersed in the oil of the first oil tank 30, avoiding the risk of air suction of traditional external pumps. The power of the electronic pump m can be dynamically adjusted according to the working conditions of the transmission.

[0054] The first oil tank 30 serves as the main oil tank, which is used to collect the lubricating oil at the bottom of the transmission and realize the circulating supply of the oil through the electronic pump m; the second oil tank 40 is located above the clutch shaft system installation part d and the generator input shaft system installation part e, and receives the oil from the third oil circuit and part of the splashing lubricating oil, which is used to forcibly lubricate the mechanical components in the clutch shaft system installation part d and the generator input shaft system installation part e; the third oil tank 50 is located above the side of the drive motor input shaft system installation part a, the intermediate shaft system installation part b, and the differential installation part c, which is used to forcibly lubricate the mechanical components in the intermediate shaft system installation part b and the differential installation part c. The partition design of the three oil tanks optimizes the oil distribution efficiency through the combination of gravity reflux and pumping.

[0055] In some embodiments, such as Figure 2As shown, the first fuel tank 30 includes a first oil baffle 301 of the first fuel tank, a second oil baffle 302 of the first fuel tank, a third oil baffle 303 of the first fuel tank, and a fourth oil baffle 304 of the first fuel tank. The first oil baffle 301 and the second oil baffle 302 of the first fuel tank are located on the left housing 1 and enclose the left part of the first fuel tank 30 with the cavity wall of the left housing 1; the third oil baffle 303 and the fourth oil baffle 304 of the first fuel tank are located on the right housing 2 and enclose the right part of the first fuel tank 30 with the cavity wall of the right housing 2.

[0056] Actually, the first fuel tank 30 is located at the bottom inside the hybrid transmission and is formed by the first oil baffle 301 and the second oil baffle 302 of the first fuel tank located on the left housing 1, the third oil baffle of the first fuel tank and the fourth oil baffle 304 located on the right housing 2, and is enveloped by the left housing 1 and the right housing 2.

[0057] In some embodiments, as Figure 2 As shown, the second fuel tank 40 includes a first oil baffle 401 of the second fuel tank and a second oil baffle 402 of the second fuel tank. The first oil baffle 401 of the second fuel tank is located on the left housing 1 and encloses the left part of the second fuel tank 40 with the cavity wall of the left housing 1; the second oil baffle 402 of the second fuel tank is located on the right housing 2 and encloses the right part of the second fuel tank 40 with the cavity wall of the right housing 2.

[0058] Actually, the second fuel tank 40 is located above the clutch shaft shafting installation part d and the generator input shaft shafting installation part e and is formed by the first oil baffle 401 of the second fuel tank located on the left housing 1 and the second oil baffle 402 of the second fuel tank located on the right housing 2 and is enveloped by the left housing and the right housing.

[0059] During specific operation, the second fuel tank 40 is adjacent to the clutch shaft shafting installation part d and the generator input shaft shafting installation part e. On the one hand, it is beneficial to shorten the internal oil path in the housing connecting the second fuel tank 40 and the clutch shaft shafting installation part d and the internal oil path in the housing connecting the second fuel tank 40 and the generator input shaft shafting installation part e; on the other hand, the second fuel tank 40 shares the oil baffle with the clutch shaft shafting installation part d and the generator input shaft shafting installation part e, so that the clutch shaft shafting installation part d and the generator input shaft shafting installation part e can also be directly cooled by heat exchange, improving the cooling efficiency of the clutch shaft shafting installation part d and the generator input shaft shafting installation part e.

[0060] Furthermore, the second fuel tank 40 also includes a first flow dividing rib 403 and a second flow dividing rib 404 in the second fuel tank. One end of the first flow dividing rib 403 of the second fuel tank is connected to the first oil baffle 401 of the second fuel tank; one end of the second flow dividing rib 404 of the second fuel tank is connected to the second oil baffle 402 of the second fuel tank.

[0061] During specific operation, the first oil diversion rib 403 and the second oil diversion rib 404 of the second oil tank divide the lubricating oil stored inside the second oil tank 40 into two parts. One part flows into the installation part e of the generator input shaft shafting to lubricate the mechanical components inside the installation part e of the motor input shaft shafting; the other part flows between the installation part d of the clutch shaft shafting and the installation part b of the intermediate shaft shafting to lubricate the gears meshing between the clutch shaft shafting and the intermediate shaft shafting. At the same time, the first oil diversion rib 403 and the second oil diversion rib 404 of the second oil tank can also reinforce and maintain the cavity structure of the second oil tank 40, preventing the second oil tank 40 from deforming or collapsing due to external forces.

[0062] In some embodiments, as Figure 2 shown, the third oil tank 50 includes a first oil retaining rib 501 and a second oil retaining rib 502 of the third oil tank. The first oil retaining rib 501 of the third oil tank is located on the left housing 1 and encloses the left part of the third oil tank 50 with the cavity wall of the left housing 1; the second oil retaining rib 502 of the third oil tank is located on the right housing 2 and encloses the right part of the third oil tank 50 with the cavity wall of the right housing 2.

[0063] Actually, the third oil tank 50 is located above the side of the installation part a of the drive motor input shaft shafting, the installation part b of the intermediate shaft shafting, and the differential installation part c, and is formed by enclosing the first oil retaining rib 501 of the third oil tank located on the left housing 1 and the second oil retaining rib 502 of the third oil tank located on the right housing 2 with the left housing and the right housing.

[0064] During specific operation, the third oil tank 50 is adjacent to the installation part a of the drive motor input shaft shafting, the installation part b of the intermediate shaft shafting, and the differential installation part c. On the one hand, it is beneficial to shorten the internal oil path in the housing connecting the third oil tank 50 and the installation part b of the intermediate shaft shafting, and the internal oil path in the housing connecting the third oil tank 50 and the differential installation part c; on the other hand, the third oil tank 50 shares the oil retaining ribs with the installation part a of the drive motor input shaft shafting, the installation part b of the intermediate shaft shafting, and the differential installation part c, enabling the installation part a of the drive motor input shaft shafting, the installation part d of the clutch shaft shafting, and the installation part e of the generator input shaft shafting to directly cool down through heat exchange, improving the cooling efficiency of the installation part a of the drive motor input shaft shafting, the installation part d of the clutch shaft shafting, and the installation part e of the generator input shaft shafting.

[0065] Furthermore, the third oil tank 50 also includes a first oil diversion rib 503 and a second oil diversion rib 504 of the third oil tank. One end of the first oil diversion rib 503 of the third oil tank is connected to the first oil retaining rib 501 of the third oil tank; one end of the second oil diversion rib 504 of the third oil tank is connected to the second oil retaining rib 502 of the third oil tank.

[0066] During actual operation, the first flow-dividing rib 503 and the second flow-dividing rib 504 of the third fuel tank divide the lubricating oil stored at the inner bottom of the third fuel tank 50 into two parts. One part flows into the intermediate shaft system installation part b for the mechanical components therein; the other part flows into the differential installation part c for the mechanical components therein. At the same time, the first flow-dividing rib 503 and the second flow-dividing rib 504 of the third fuel tank can also reinforce and maintain the cavity structure of the third fuel tank 50, preventing the third fuel tank 50 from deforming or collapsing due to external forces.

[0067] During specific design and manufacturing, the first oil-blocking rib 301, the second oil-blocking rib 302 of the first fuel tank, the first oil-blocking rib 401, the first flow-dividing rib 403 of the second fuel tank, the first oil-blocking rib 501, and the first flow-dividing rib of the third fuel tank 503 are cast together with the left housing 1 to ensure the structural stability of the left housing 1;

[0068] The third oil-blocking rib 303, the fourth oil-blocking rib 304 of the first fuel tank, the second oil-blocking rib 402, the fourth flow-dividing rib 404 of the first fuel tank, the second oil-blocking rib 502, and the second flow-dividing rib 504 of the third fuel tank of the right housing 2 are cast together with the right housing 2 to ensure the structural stability of the right housing 2.

[0069] In some embodiments, as Figure 3 shown, it further includes a motor housing 3. The motor housing 3 is a semi-enclosed structure and is fixed to the left housing 1 by bolts. It has an independent oil passage network integrated inside. The motor housing 3 and the back surface of the left housing 1 enclose a motor assembly installation part. The motor assembly installation part includes a drive motor installation part f and a generator installation part g. The drive motor installation part f corresponds and communicates with the drive motor input shaft system installation part a; the generator installation part g corresponds and communicates with the generator input shaft system installation part e.

[0070] In some embodiments, as Figure 4 shown, a heat exchanger n is integrated on the left housing 1. One end of the heat exchanger n is connected to the outlet of the electronic pump m through the internal oil passage of the left housing 1, and the other end is connected to the motor assembly installation part through the internal oil passage of the left housing 1.

[0071] Actually, the heat exchanger n adopts a plate structure and is integrated on the left housing 1. Its coolant flow channels and oil flow channels are arranged in an interleaved manner to maximize the heat exchange efficiency. After the oil flows through the heat exchanger n from the outlet of the electronic pump m, it is then distributed to the motor and clutch areas through the oil hole 103, significantly reducing the heat load of key components.

[0072] In some embodiments, as Figure 5 、 6As shown, an oil return port 131 is provided in the first fuel tank 30. The oil return port 131 penetrates through the bottom of the left housing 1 and communicates the first fuel tank 30 with the motor assembly installation part.

[0073] In fact, the oil return port 131 is designed to be located in the upper part of the first fuel tank 30 and is used to receive the oil splashed from the motor assembly installation part. The oil flows back to the first fuel tank 30 naturally under the action of its own gravity, reducing the load pressure of the electronic pump m. The width of the oil return port 131 is optimized through simulation to ensure the oil return efficiency under high-speed operating conditions.

[0074] Specifically, as Figure 4 , 5 , as shown in Figure 6, the oil suction port 101 is located on the left housing 1. The oil in the first fuel tank 30 is pumped into the electronic pump m through the oil suction port 101. The oil at the outlet of the electronic pump m passes through the internal oil passage of the left housing 1 and enters the heat exchanger n through the oil passage port 102 located on the left housing 1. The oil passing through the heat exchanger passes through the oil passage port 103 located on the left housing 1, passes through the internal oil passage of the left housing 1, flows through the oil passage hole 104 located on the left housing 1, and flows through the oil passage hole 105 located on the motor housing 3. Part of the oil goes to the generator along the first oil path for cooling and lubrication, and the remaining oil goes to other components along the second oil path. Among them, the oil passage hole 104 located on the left housing 1 and the oil passage hole 105 located on the motor housing 3 are located in the same plane of the same oil path.

[0075] As Figure 8 , 9 , as shown in the figure, the oil going to the generator along the first oil path passes through the internal oil passage of the motor housing 3. Part of it goes to the generator stator through the oil passage hole 106, and the other part goes along the internal oil passage of the motor housing 3. Part of it goes to the generator bearing through the oil passage hole 107, and the remaining oil goes to the generator rotor.

[0076] As Figure 9 , as shown in the figure, part of the oil flowing along the second oil path goes along the third oil path to the clutch and the second fuel tank 40 for lubrication and cooling; the remaining part goes to other components along the fourth oil path.

[0077] As Figure 5 , 6As shown in Figures 7, 8, and 9, the oil flowing along the third oil passage to the clutch and the second fuel tank 40 passes through the internal oil passage of the motor housing 3, flows through the oil passage hole 108 on the motor housing 3, flows through the oil passage hole 109 on the left housing 1, passes through the internal oil passage of the left housing 1, a part of it flows through the oil passage hole 110 on the left housing 1, flows through the oil passage hole 111 on the right housing 2, passes through the internal oil passage of the right housing 2, and goes to the clutch for cooling through the oil passage hole 112. The remaining part goes to the second fuel tank 40 through the oil passage hole 113 on the left housing 1. Among them, the oil passage hole 108 on the motor housing 3 and the oil passage hole 109 on the left housing 1 are located on the same plane of the same oil passage, and the oil passage hole 110 on the left housing 1 and the oil passage hole 111 on the right housing 2 are located on the same plane of the same oil passage.

[0078] As Figure 9 shown, a part of the oil flowing along the fourth oil passage flows along the fifth oil passage to cool the drive motor; the remaining part flows along the sixth oil passage to other components.

[0079] As Figure 8 、 9 shown, the oil flowing along the fifth oil passage to the drive motor passes through the internal oil passage of the motor housing 3. A part of it goes to the drive motor stator through the oil passage hole 114, and the other part passes through the internal oil passage of the motor housing 3 and goes to the drive motor bearing through the oil passage hole 115.

[0080] As Figure 5 、 6 As shown in Figures 7, 8, and 9, the oil flowing along the sixth oil passage flows through the oil passage hole 116 on the motor housing 3, flows through the oil passage hole 117 on the left housing 1. A part of it flows along the internal oil passage of the left housing 1 and goes to the third fuel tank 50 through the oil passage hole 119 on the left housing 1; another part flows along the internal oil passage of the left housing 1 and goes to the drive motor input shaft bearing seat through the oil passage hole 120 on the left housing 1. The oil can flow from the drive motor input shaft bearing seat to the intermediate shaft bearing seat through the oil passage hole 122 along the internal oil passage of the left housing 1 through the oil passage hole 121; the remaining part flows through the oil passage hole 118 on the left housing 1, flows through the oil passage hole 123 on the right housing 2, passes through the internal oil passage of the right housing 2. A part of it goes to the drive motor input shaft bearing seat for lubrication through the oil passage hole 124, and the remaining part passes through the internal oil passage of the right housing 2 and goes to the drive motor rotor for cooling through the oil passage hole 125. Among them, the oil passage hole 116 on the motor housing 3 and the oil passage hole 117 on the left housing 1 are located on the same plane of the same oil passage, and the oil passage hole 118 on the left housing 1 and the oil passage hole 123 on the right housing 2 are located on the same plane of the same oil passage.

[0081] During specific design and manufacturing, the oil suction port 101, oil passing holes 102, 103, 104, 109, 110, 113, 117, 118, 119, 120, 121, 122, 132, 133 located on the left housing 1 are obtained by machining. By changing the size of the oil passing holes and the diameter of the oil channels connected to the oil passing holes, the purpose of changing the flow rate through the oil passing holes can be achieved;

[0082] The oil passing holes 111, 112, 123, 124, 125, 126, 127, 128, 129, 130, 134 located on the right housing 2 are obtained by machining. By changing the size of the oil passing holes and the diameter of the oil channels connected to the oil passing holes, the purpose of changing the flow rate through the oil passing holes can be achieved;

[0083] The oil passing holes 105, 106, 107, 108, 114, 115, 116 located on the motor housing 3 are obtained by machining. By changing the size of the oil passing holes and the diameter of the oil channels connected to the oil passing holes, the purpose of changing the flow rate through the oil passing holes can be achieved.

[0084] The outer contours of the first oil circuit, second oil circuit, third oil circuit, fourth oil circuit, fifth oil circuit, and sixth oil circuit of the motor housing 3 are cast together with the motor housing 3, and the inside of the oil circuits is obtained by machining to ensure the integrity and stability of the oil circuits.

[0085] Actually, a part of the lubricating oil liquid passing through the heat exchanger n goes to the first oil circuit for lubricating the generator installation part g; a part goes to the second oil circuit for lubricating the second oil tank 40 and the drive motor installation part f;

[0086] A part of the lubricating oil liquid in the second oil circuit goes to the third oil circuit for lubricating the second oil tank 40; a part goes to the fourth oil circuit for lubricating the third oil tank 50 and the drive motor installation part f;

[0087] A part of the lubricating oil liquid in the fourth oil circuit goes to the fifth oil circuit for lubricating the drive motor installation part f; a part goes to the sixth oil circuit for lubricating the third oil tank 50.

[0088] Based on the same inventive concept, the present invention also provides a hybrid transmission, and the hybrid transmission includes a hybrid transmission housing with an integrated lubrication structure as described in any one of the above.

[0089] Through an integrated design, the hybrid transmission deeply integrates the lubrication system with the housing structure, reducing the external pipeline connection points and the leakage risk. Meanwhile, the coordinated operation of the electronic pump m and the heat exchanger n ensures the lubrication and cooling requirements under all working conditions.

[0090] The specific lubrication method of the hybrid transmission of the present invention is as follows:

[0091] When the electronic pump m receives the instruction to start operating, the oil in the first oil tank 30 is pumped and sucked to flow along the internal oil passage of the gearbox. The oil enters the heat exchanger n through the oil passage port 102 on the left housing 1. The oil passing through the heat exchanger, through the oil passage port 103 on the left housing 1, passes through the internal oil passage of the left housing 1, flows through the oil passage hole 104 on the left housing 1, flows through the oil passage hole 105 on the motor housing 3. Part of the oil goes to the generator along the first oil circuit for cooling and lubrication, and the remaining oil goes to other components along the second oil circuit. The oil going to the generator along the first oil circuit, through the internal oil passage of the motor housing 3, part of it goes to the generator stator through the oil passage hole 106, and the other part along the internal oil passage of the motor housing 3, part of it goes to the generator bearing through the oil passage hole 107, and the remaining oil goes to the generator rotor.

[0092] Part of the oil flowing along the second oil circuit goes along the third oil circuit to the clutch and the second oil tank 40 for lubrication and cooling. The remaining part goes to other components along the fourth oil circuit.

[0093] The oil going to the clutch and the second oil tank 40 along the third oil circuit, through the internal oil passage of the motor housing 3, flows through the oil passage hole 108 on the motor housing 3, flows through the oil passage hole 109 on the left housing 1, through the internal oil passage of the left housing 1, part of it flows through the oil passage hole 110 on the left housing 1, flows through the oil passage hole 111 on the right housing 2, through the internal oil passage of the right housing 2, and goes to the clutch through the oil passage hole 112 for cooling. The remaining part goes to the second oil tank 40 through the oil passage hole 113 on the left housing 1.

[0094] Part of the oil flowing along the fourth oil circuit goes along the fifth oil circuit to the drive motor for cooling. The remaining part goes to other components along the sixth oil circuit.

[0095] The oil going to the drive motor along the fifth oil circuit, through the internal oil passage of the motor housing 3, part of it goes to the drive motor stator through the oil passage hole 114, and the other part along the internal oil passage of the motor housing 3, goes to the drive motor bearing through the oil passage hole 115.

[0096] The oil flowing along the sixth oil passage flows through the oil through-hole 116 on the motor housing 3, and then through the oil through-hole 117 on the left housing 1. A part of it flows along the internal oil passage of the left housing 1 and goes to the third oil tank 50 through the oil through-hole 119 on the left housing 1; another part flows along the internal oil passage of the left housing 1 and goes to the bearing seat of the driving motor input shaft through the oil through-hole 120 on the left housing 1. The oil can flow from the bearing seat of the driving motor input shaft to the bearing seat of the intermediate shaft through the oil through-hole 122 along the internal oil passage of the left housing 1 via the oil through-hole 121; the remaining part flows through the oil through-hole 118 on the left housing 1, then through the oil through-hole 123 on the right housing 2, and after passing through the internal oil passage of the right housing 2, a part goes to the bearing seat of the driving motor input shaft through the oil through-hole 124 for lubrication, and the remaining part passes through the internal oil passage of the right housing 2 and goes to the driving motor rotor through the oil through-hole 125 for cooling.

[0097] For the oil in the second oil tank 40, a part passes through the oil through-hole 132 on the left housing 1, flows along the internal oil passage of the left housing 1, and reaches the bearing seat of the generator input shaft system through the oil through-hole 133 for lubrication. Another part passes through the oil through-hole 134 on the right housing 2, flows along the internal oil passage of the right housing 2, and reaches the bearing seat of the generator input shaft system through the oil through-hole 130 for lubrication.

[0098] For the oil in the third oil tank 50, a part passes through the oil through-hole 126 on the right housing 2, flows along the internal oil passage of the right housing 2, and reaches the bearing seat of the intermediate shaft system through the oil through-hole 128 for lubrication. Another part passes through the oil through-hole 127 on the right housing 2, flows along the internal oil passage of the right housing 2, and reaches the bearing seat of the differential shaft system through the oil through-hole 129 for lubrication.

[0099] The oil flowing to the installation part f of the driving motor assembly and the installation part g of the generator assembly can flow back to the first oil tank 30 through the oil return port on the left housing 1 under the action of gravity and participate in the oil pumping cycle again.

[0100] When the transmission is running, the differential at the bottom of the transmission participates in the oil agitation. The oil adheres to the tooth surfaces of the differential gears and is thrown into the gap between the first oil retaining rib 301 of the first oil tank on the left housing 1 and the third oil retaining rib 303 of the first oil tank on the right housing 2 under the action of centrifugal force, and then flows back into the first oil tank 30 to participate in the oil pumping cycle again.

[0101] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid transmission housing with an integrated lubrication structure, characterized in that It includes a left housing (1) and a right housing (2). Both the left housing (1) and the right housing (2) are semi-enclosed cavity structures. When they are enclosed together, a complete cavity structure can be formed. The cavity structure includes a transmission assembly installation part and an oil tank part, and the transmission assembly installation part and the oil tank part are connected through an internal oil passage in the housing; The transmission assembly installation part includes a drive motor input shaft shafting installation part (a), an intermediate shaft shafting installation part (b), a differential installation part (c), a clutch shaft shafting installation part (d), and a generator input shaft shafting installation part (e); The oil tank part at least includes a first oil tank (30). The first oil tank (30) is located below the transmission assembly installation part and is connected with an electronic pump (m). The electronic pump (m) is used to pump the lubricating oil in the first oil tank (30) into the internal oil passage in the housing. The oil tank part also includes a second oil tank (40) and a third oil tank (50). The second oil tank (40) and the third oil tank (50) are located above the transmission assembly installation part and receive the lubricating oil flowing out of the internal oil passage in the housing. The bottoms of the second oil tank (40) and the third oil tank (50) are respectively connected with oil passing holes, and the oil passing holes are respectively used to guide the lubricating oil to the hole parts of the transmission assembly installation part.

2. The hybrid transmission housing with an integrated lubrication structure according to claim 1, characterized in that, The second oil tank (40) is located above the clutch shaft shafting installation part (d) and the generator input shaft shafting installation part (e).

3. The hybrid transmission housing with an integrated lubrication structure according to claim 2, characterized in that, The second oil tank (40) also includes a first second-oil-tank dividing rib (403) on the left housing (1) and a second second-oil-tank dividing rib (404) on the right housing (2). The combination of the two divides the lubricating oil at the bottom of the second oil tank (40) into two parts. One part is used to lubricate the gears meshing between the clutch shaft shafting and the intermediate shaft shafting, and the other part is used to lubricate the generator input shaft shafting installation part (e).

4. The hybrid transmission housing with an integrated lubrication structure according to claim 1, characterized in that, The third oil tank (50) is located at the upper side of the drive motor input shaft shafting installation part (a), the intermediate shaft shafting installation part (b), and the differential installation part (c).

5. The hybrid transmission housing with an integrated lubrication structure according to claim 4, characterized in that, The third oil tank (50) also includes a first third-oil-tank dividing rib (503) on the left housing (1) and a second third-oil-tank dividing rib (504) on the right housing (2). The combination of the two divides the lubricating oil at the bottom of the third oil tank (50) into two parts. One part is used to lubricate the intermediate shaft shafting installation part (b), and the other part is used to lubricate the differential installation part (c).

6. The hybrid transmission housing with an integrated lubrication structure according to claim 1, characterized in that, The back of the left housing (1) is also connected to a motor housing (3). The motor housing (3) is a semi-enclosed structure, and it encloses with the back of the left housing (1) to form a motor assembly installation part. The motor assembly installation part includes a drive motor installation part (f) and a generator installation part (g). The drive motor installation part (f) corresponds to and communicates with the drive motor input shaft shafting installation part (a); the generator installation part (g) corresponds to and communicates with the generator input shaft shafting installation part (e); the motor housing (3) is provided with a plurality of oil paths for guiding lubricating oil to flow in the transmission assembly installation part, the fuel tank part, and the motor assembly installation part.

7. The hybrid transmission housing with an integrated lubrication structure according to claim 6, characterized in that, The oil paths on the motor housing (3) at least include a first oil path and a second oil path. The first oil path is used for guiding lubricating oil to the generator installation part (g); the second oil path is used for guiding lubricating oil to the second fuel tank (40) and the drive motor installation part (f).

8. The hybrid transmission housing with an integrated lubrication structure according to claim 7, characterized in that, The destinations of the lubricating oil on the second oil path include a third oil path and a fourth oil path. The third oil path is used for guiding lubricating oil to the second fuel tank (40); the fourth oil path is used for guiding lubricating oil to the third fuel tank (50) and the drive motor installation part (f).

9. The hybrid transmission housing with an integrated lubrication structure according to claim 8, characterized in that, The destinations of the lubricating oil on the fourth oil path include a fifth oil path and a sixth oil path. The fifth oil path is used for guiding lubricating oil to the drive motor installation part (f); the sixth oil path guides lubricating oil to the third fuel tank (50).

10. A hybrid transmission, characterized in that, The hybrid transmission includes a hybrid transmission housing with an integrated lubrication structure as described in any one of claims 1-9.

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